CI: remove various tools from macOS

zstd, openssl, and quilt are already built in tools/. No need to install
them.

The rest are unused.

Signed-off-by: Rosen Penev <[email protected]>

.github/workflows/tools.yml

@@ -54,19 +54,13 @@ jobs:
             gnu-sed \
             gnu-tar \
             grep \
-            libidn2 \
-            libunistring \
             m4 \
             make \
             mpfr \
             ncurses \
-            [email protected] \
             pcre \
             pkg-config \
-            quilt \
-            readline \
-            wget \
-            zstd
+            wget
 
             echo "/bin" >> "$GITHUB_PATH"
             echo "/sbin/Library/Apple/usr/bin" >> "$GITHUB_PATH"